I personally have difficulty understanding what "cute" is on an emotional level, workin' on it, currently feeling tinges in response to this but I do understand the logical basis of what "cute" is. "Cute" is a genetically programmed response in humans. Particularly small and fluffy animals are more commonly young and/or harmless. Because of this, they are not dangerous to handle, and can even be trained in some cases. "Cute" is your brain's way of giving the all-clear. And because this video involves a small, fluffy creature, ours brains give the all-clear, and we perceive it as cute.